Composite metal article



Nov. 8, 192 7.

W. EHLERS COMPOSITE METAL ARTICLE Filed Jan. 18. 1926 Inve ntor.\A/ClltheT Ehler's, by His Attorney.

Patented Nov. '8, 1927.

UNITED STATES PATENT OFFICE.

WALTHER EHLERS, F BERLIN, GERMANY, ASSIGNOR TO GENERAL ELECTRIC COM-PANY, A CORPORATION OF NEW YORK.

COMPOSITE METAL ARTICLE.

Application filed January 18, 1926, Serial No. 82,169, and in GermanyFebruary 4, 1925.

My present invention relates to the construction of metal bodies frompowdered material, and more particularly to bodies especially adaptedfor electrical purposes 6 such as magnetic cores or resistance elements.

In the construction of such bodies, particularly for magnetic pu oses.it is desirable that the space OccllPled by the body 10 shall be filledas completely as possible with the magnetic material.

The object of my invention is to provide a. construction whereby thisdesirable feature may be attained.

It has been proposed heretofore to employ powder particles of variousshapes and sizes in the construction of articles of the class describedsuch for example as round particles of different sizes as well as flakyparticles.

I have found, however, that a better ntili zation of the space may beobtained by the use of metal particles all of which or the greater partof which are of approximately spindle shape. By the terms spindle shapeI mean shat the metal particles are approximately circular in crosssection and taper from the middle toward each end.

In the accompanying drawing, F ig. 1 is an enlarged view of a portion ofan article made of round particles of different sizes and Fig. 2 is asimilar view of an article made of spindle shaped particles.

It is obvious from an inspection of these figures that the spindleshaped particles on account of their pointed ends render possible abetter utilization of the space than do the round particles. By pressingthe spindle shaped particles together there may be obtained a firm andcompact body which in the case where magnetic materials are used willhave a good degree of permeability.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is: 1. A composite metal body made up of closely compactedspindle-shaped particles of metal.

2. A composite magnetic body made up of closely compacted spindle-shapedparticles 5 of magnetic material.

3. A composite magnetic body largely made up of closely con'ipactedparticles of magnetic material, the greater part of said particles beingapproximately spindlcshaped.

In witness whereof, I have hereunto set my hand this 17th day ofDecember, 1925;

WALTHER EHLERS.

